It is not possible to boot rEFIt with MEMDISK or grub4dos.The rEFIt ISO is not a BIOS bootable Eltorito CD (which format is understood by MEMDISK and grub4dos), but a CD format only bootable on a Mac which uses EFI (the CD has hfsplus as filesystem).

Ok, so if I wanted to do this, I would need to extract the file/folder tree from the iso and put it in the root of the boot CD build. Then I could start it from isolinux via a call to the .efi boot file.

Ok, so if I wanted to do this, I would need to extract the file/folder tree from the iso and put it in the root of the boot CD build. Then I could start it from isolinux via a call to the .efi boot file.

Are you asking? Or are you stating that your described method actually works?

I was thinking it would be better not to have to lay out the entire directory from this iso into the root of the CD. What about extracting the iso into memory, and then executing it from there? Or re-compressing the image into a format Linux understands, so it can be executed once called.

I think you need to read the rEFIt documentation (from 2007) at their website. It is supposed to be much simpler than that. The docs include install from CD, booting either the CD or another already-installed OS, and so on. So, no need to extract/expand the ISO.

The key here is to understand what is (U)EFI, which already includes a boot loader. There are several boot managers somehow compatible, and I already posted links to them.

So to test this in VirtualBox, you MUST set your VM to use EFI (in the "system" properties of your VM), and to understand that the OS needs to be EFI-aware.

The links I already provided state several examples of Apple-based OSs that should work with EFI, in addition to some links to Fedora, Gentoo and Debian (and even some versions of Windows).

The CD of rEFIt is supposed to be added to the boot menu, and the rEFIt documentation also explains how to display the boot menu (command key related).

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